As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5819 - IND-DAY - FLIGHT CREW DIVERTED FLIGHT TO IND DUE TO WING ANTI ICE/RA FAIL, ASSOCIATED TO PACK 1 VALVE CLOSED AND PACK 2 OVERHEAT. EWR MX PERFORMED WING ANTI ICE TEST AND COULD NOT DUPLICATE MESSAGE. MX REMOVED AND REPLACED LARGE DUCT CONNECTED TO AFT SIDE OF DUAL TEMP CONTROL VALVE AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.